monumentation

navigate by keyword : monumentaion control point monumentation whennm surveyors indicate reference place permanent marker ground location surveyers futor future referance network simple easy miss round brass disc flat indicates city college francisco one materials used needed county

Washington Monument on a cloudy day under blue skies Royalty Free Stock Photo

Monument stands alone in a vast, barren landscape under a dramatic sky at dusk Royalty Free Stock Photo

When surveyers need to indicate a reference point, they place a permanent marker in the ground location for future reference. This is known as a Monumentation Network. These are simple, easy to miss round disc flat in the ground. Although this one is brass, other materials can also be used, as needed. This disc indicates it is from the City and County of San Francisco.